A few months ago I bought a box of military surplus .45 caliber brass bore brushes. There was a little over 1,000. In addition there was a couple hundred steel brushes. Identical, but in steel. I've been referring to them as stainless but I don't know this to be a fact. They almost look blued. I realize people generally don't want to use a steel brush but my question is, how did these come to be? Was it because brass was hard to get at some point? Or were they issued for a seperate reason?

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